fix(unocrm): drive the Contacts FeedView from the generated ContactsViewModel, not the mock

A FeedView must bind to a real feed, which only the code-generated view model provides — a
plain mock record can't drive it. So:
- ContactsPage seeds its design-time DataContext with `new ContactsViewModel()` (the generated
  VM whose parameterless ctor builds a ContactsModel + its reactive SourceContext); Hot Design is
  a live app, so the FeedView's list feed pumps and renders at design time.
- ContactsPageMockData is removed (a workaround for the old plain-ListView approach; it can't feed
  a FeedView), along with the earlier ListFeed.Async mock hack.
- ContactsPreviews now hosts the page with its generated VM (a single populated "Contacts"
  preview). The no-results state isn't authored: it depends on the live filter state, which can't
  be preset on the generated VM at design time.

Verified: Debug build succeeds.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

Author: Jen-Uno

studio/uno-crm/UnoCRM/Presentation/ContactsPage.xaml.cs

@@ -3,7 +3,6 @@
 using Mapsui.Projections;
 using Mapsui.Styles;
 using Mapsui.Tiling;
-using UnoCRM.Presentation.MockData;
 
 namespace UnoCRM.Presentation;
 
@@ -19,9 +18,12 @@ public ContactsPage()
     {
         this.InitializeComponent();
 
-        // Design-time DataContext for Hot Design / Studio (seed on the page, never a child).
-        // At runtime Uno.Extensions Navigation injects the generated ContactsModel VM.
-        this.DataContext = ContactsPageMockData.Data;
+        // Design-time DataContext for Hot Design / Studio: the code-generated ContactsViewModel. Its
+        // parameterless ctor builds a ContactsModel and its reactive SourceContext, so the page's
+        // FeedView is driven by a real list feed at design time — a FeedView needs a feed and cannot
+        // be driven by the plain mock record. At runtime Navigation injects the mapped
+        // ContactsViewModel, which overrides this.
+        this.DataContext = new ContactsViewModel();
 
         Loaded += OnLoaded;
     }

studio/uno-crm/UnoCRM/Presentation/MockData/ContactsPageMockData.cs

@@ -2,19 +2,15 @@
                  xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
                  xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
                  xmlns:local="using:UnoCRM.Presentation"
-                 xmlns:mock="using:UnoCRM.Presentation.MockData"
                  xmlns:hd="using:Uno.UI.HotDesign"
                  xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
                  xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
                  mc:Ignorable="d">
 
-    <!-- ContactsPage populated vs. no-results. Note: the Mapsui map is populated in code-behind (not
-         data-bound), so it shows an empty basemap; the filters/stats/list are the bound surface. -->
-    <hd:Preview PreviewName="All" Visibility="Collapsed">
-        <local:ContactsPage DataContext="{x:Bind mock:ContactsPageMockData.Data}" />
-    </hd:Preview>
-
-    <hd:Preview PreviewName="No Results" Visibility="Collapsed">
-        <local:ContactsPage DataContext="{x:Bind mock:ContactsPageMockData.NoResults}" />
+    <!-- ContactsPage driven by its code-generated ContactsViewModel (seeded in the page ctor), so the
+         FeedView renders real contacts. The empty / no-results state isn't authored here because it
+         depends on the live filter state, which can't be preset on the generated VM at design time. -->
+    <hd:Preview PreviewName="Contacts" Visibility="Collapsed">
+        <local:ContactsPage />
     </hd:Preview>
 </hd:PreviewGroup>